gearing vs mpg

Hey Joe,
You can actually change that final gear ratio on there to a .68 (thats what mine is)...I figure in town i will be fine with the 1:1, its the highway im more concered about...at 65 mph i will be turning 2100rpm...how does the sound? and moper, the cam is not degreed...its been in there for a long time, im just going fire up the motor to make sure it runs (after basic inspection) and then stick it in the car...probably wont see another cam until a rebuild i suppose...With this cam you say you have doubts about it coming in at 2200..when do you actually think it hits? also, i understand that being in the efficiency range will net me better mileage, but what about guys who run real high horsepower cars on the highway...their powerbands kick in at around 3k lets say, but with an overdrive they are turning rpms 2500 and under (some alot more under that)...how do they get away with it? I'd rather not change my gears from a 3.91 to anything higher...i already 3.23's in teh pig right now, but i want the added oomph of the 3.91's that i have